TLE6211 datasheet(18/35 Pages) INFINEON

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TLE 6210

TLE 6211

Block Description and Electrical Characteristics

V1.2 Data Sheet

2002-08

Supervision

The TLE 6210 and TLE 6211 are equipped with a complex supervision logic. The input

voltage and the regulator output voltage is supervised. In addition two

m-controller are

supervised by independent watchdog circuits.

4.9

Overvoltage and Undervoltage

Both the supply voltage

UZP and the output voltage UST are supervised for over- and

undervoltage.

In case any undervoltage or overvoltage condition at

UST or UZP is detected, the reset

outputs RES1 and RES2 are switched to low state. RES1 and RES2 are not controlled

by the watchdog logic.

To supervise the output voltage

UST an independent bandgap from the reference

bandgap is used.

The reset outputs RES1 and RES2 are together controlled by the

UST reset logic and

the supply undervoltage lockout (UVLO) and overvoltage lockout (OVLO).

A logic High at the RES1 and RES2 indicates normal operation. The outputs are open

collector type outputs with integrated pull-up resistors to

UST. Even when the UST

voltage drops, the reset outputs RES1 and RES2 remain low (< 0.4 V).

Both undervoltage and overvoltage detection of

UST and UZP use a voltage hysteresis

to avoid any reset toggling.

Undervoltage and Overvoltage Detection

UST

The

UST output voltage has to be externally connected to the USTS sense input.

To be able to detect also wrong output voltages causes by a malfunction of the related

bandgap reference for supervision an independent bandgap is used.

As soon as any reset condition is detected the RES1 and RES2 go low.

4.9.1

Undervoltage Lockout (UVLO) and Overvoltage Lockout (OVLO)

The supply voltage

UZP is supervised as well. If the voltage rises above the upper

threshold value of 19.5 V reset is asserted. When an undervoltage occurs, after some

time the output voltage will drop below the reset threshold and a reset is asserted. The

undervoltage lockout is only valid during power up.

Both the OVLO and the UVLO threshold use a hysteresis to avoid reset glitches. In

addition the OVLO is digitally filtered. Overvoltage below 2 to 3 clock cycles (equals

typical 2 µs or 3 µs) are neglected to avoid resetting the system when any inductive load

is switched off.

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